/Engine/Source/Editor/UnrealEd/Public/EditorActorFolders.h
Get folder name that is unique under specified parent path
[FFolder](API\Runtime\Engine\FFolder) GetFolderName ( [UWorld](API\Runtime\Engine\Engine\UWorld) & InWorld, const [FFolder](API\Runtime\Engine\FFolder) & InParentFolder, const [FName](API\Runtime\Core\UObject\FName) & InLeafName )